VMS Help CONV$ Routines, CONV$PASS_FILES, Condition Values Returned  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    SS$_NORMAL         Normal successful completion.
    CONV$_INP_FILES    Too many input files.
    CONV$_INSVIRMEM    Insufficient virtual memory.
    CONV$_NARG         Wrong number of arguments.
    CONV$_ORDER        Routine called out of order.